Grinding-mill.



110.834.507. l j PTENTED 001230, 1906. G.0ARLSON.

GRINDING MILL.

Arrmonlon Hmm 001.19'. 1904. v

PATENTED OCT. 30, '1906.v

G. oARLsoN..

GRINDING MILL. l APPLICATION FILED 001.19. V1904.

mr Noruus nun co.. wAsmnarolv. u, c;

. U NITED 'srnrnsjignnr OFFICE. I GARIEL CARLSON, OF SPRINGFIELD,v MASSACHUSETTS.

' Specification of Letters Patent.

Patented oct. 3o, 190B.

Application filed October 19, 1904. Serial No. 229,089.

` ing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and usefullmprovements in Grinding- Mills, of which the following is a specification.

This invention relates to grinding-mills, and particularly to that class of mill known as a powdering-mill, the object of the invention being to provide a construction in which the grinding-surfaces are so disposed as to result in a very large grinding area relative to the size of the mill, whereby the efficiency of la millof a given size and cost is greatly increased; and the invention consists in the' novel construction described in the Jfollowing specification and pointedout in the claims.

i In the drawings accompanying this specification, Figure 1 is a sectional elevation of a grinding-mill in the direction of the arrows shown in Fig. 2, in which the invention is embodied, said section being in the plane of line 1 1, Fig. 2, looking to the left, the lowermost millstone not being included in the section, but its position being indicated by dotted lines. The position of a scraper-trough isl also shown in this figure in dotted lines, thoughit falls naturally outside the parts shown. Fig. 2 is a plan view' of the mill, taken at right angles to the axis of the latter. Fig. 3 is a perspective view of a scraper to ref. move material adhering to one of the grinding-surfaces of the mill.

Referring now to the drawings,and more particularly to Fig. 1, it is seen that the construction embraces a circular base a., the upper surface of which is diagonal to its base. The upper edge of the base isflanged, as at b, to receive a similarly-flanged cylindrical casin c, which is bolted to said inclined upper si e of the base. Within this casing c acircular bed-stone d is mounted ona spindle e, said stone being provided with a cylindrical curb f, tightly fitted thereto and extending nearly to the top of the casing c, the upper edge of which curb has fitted thereto an inwardlyprojecting flange g in the shape of a ring, as shown in Fig. 1. very clearly. j

- The upper edge of the casing c has secured thereto a ring h, projecting inwardly from the edge of thecasing and overlapping the flange g1', This construction constitutes a closure for the space between the curb fand the inner wall of the casing, the diameter of the curb being somewhat less than the inner diameter of the casing. y

Diametrically across the casin there extends a bar j, secured in any suit'a, "lelmann'e'r to opposite sides thereof. In this bar ,is "a bearin for the upper end of thev spindle e,

which earing is in the form of a boss m, cast integral therewith. From opposite sides of this boss thereexte'nd' two arms-one, o, extending toward the upper sideof the casing, and the other, p, extending -in the opposite direction-said arms being somewhat diagonally disposed relative to the bari, as shown in the plan view Fig. 2.A Both these arms are integral with the r jand1the arm ois to ycarry a scraper-stem 25, andthe arm p is to carry the stud of an intermediate gear `10,

which meshes with a gear 20 on the spindle e and with two other gears 21 and 22 on the shafts which carry the millstones.

The lower end of the spindle e is mounted in a step r, which is cast integral with a plate s, bolted to lthe base of the mill and from which plates there extends upwardly an arm t, in the upper end of which is a bearin c for the s indle, the latter being held in its inoline position (which is the same as the axis of the bed-stone d) by means of thisbearing and its' step r, referred to, save for suchsupport as is provided for the lower edge of the stone, to be referredy to farther on.

The bed-stone d is mounted on a circular frame consisting of a ring w, from which the arms y extend radially toward the hub 3, of which they and the ring wfform a part. The

under surface of the outer edge of this ring 4under the bed-stone and is provided withthe pulley 8 on its outer end, whereby it may be rotated. In this manner the bedstone and its attached curb f is rotated. Said stone is firmlysecured to its frame in anyconvenient way.

In the end ofthe arm p (which extends toward the lower side of the mill, and as stated, preferably forms part of the ba'rj) there is located a stud 9, parallel with the spindle e, and there runs freely on this stud and 13 are secured to said nation of this figure that by a gear 10, and below the gear two arms 12 stud to swing freely thereon, said arms extending in opposite'directions. In the free end of each of these arms the studs 15 and 16 are located, these being also parallel with the spindle. These last-named studs serve as axes for the two millstonesv 17 and 18, which -fit freely on said studs. It will be remembered that the axes of these millstones are fixed in the ends of arms 12 and 13, which are free to swing on the stud 9. Therefore these millstones will swing down into contact with the curb f, and the arms 12 and-13 are so proportionedthat the stones will bear also against one another, as shown in Fig. 2. Itis clear from an examiinclining the arm p slightly to one side of a rectangular position relative to the bar j the stone 17 will receive the weight or thrust of the stone 18 to a greater degree than if the arm p were l located at right angles to said bar, and the arm p is thus located because of the fact that the bed-stone and its curb rotate in the direction of the arrow shown in Fig. 2, and by4 locating the millstone as described their tendency isvalways to run back against the direction of movement of the curb, and thereby resisting any tendency to climb the upwardly-moving side of the curb.

Mention has been made of the gear 10. This constitutes an intermediate driving connection between a gear 20, keyed to the spindle just under the bearing end, andthe gears 21 and 22, secured, respectively, to the millstones 17 and 18`in any desirable way. Preferably these stones would be provided with a metal bushing, to which these gears would be attached.

It will also be observed that the gear 21 is smaller than the gear 22 and that it is about the same ldiameter as the driving-gear-2O on the-spindle. Therefore its speed of rotation will be practically the same as that of the curb f; but the millstone being in contact with thecurb there will be a difference in the circumferential speeds, the millstone traveling the faster because of the difference in the 'radius of the stone as compared with the curb. The gear 22, however, being larger than 2l will rotate the stone 18 at less circumferential speed than the stone 17, and

because of the fact these gears are located each side of the intermediate they will be rotated in the same direction and both of them in a direction contrary to the direction of the curb and bed-stone.

As a result of this disposition ofthe elements of this machine a milling or grinding surface will be provided between the lower ends of'each of the stones 17 and 18 and the bed-stone, and there will be a like surface between each of the stones and the curb, and still another surface at the point of contact of the two stones, for while the latter rotate in the same direction the stone 18 has a circumferential speed greater than that of the stone 17 and hence there will be an abrading action between the two.

The action of the millstones relative to the bed-stone is peculiar in that they rotate in fixed planes in contact with said bed-stone ou an axis at right angles to the latter and in the same direction as the bed-stone.

Secured to the arms 12 and 13 are suitable Scrapers 23 and 24, whereby the tops of the millstones are kept free from the accumulation of any material being ground, and, as shown in Fig. 1, there extends from the arm o downward a post 25, on the lower end of which is a scraper 26, which bears against the spindle to keep it free from any material being ground, which, especially in the case of wet grinding, is liable to work up on the spindle and get into the bearing.

On the high side of the curb a scraper 27 is arranged to bear on the inner surface of the curb to keep the latter clear of any adhering material. This -scraper is hung on the edge of the casing and secured thereto by bolts or otherwise. Secured to the scraper is a trough 27, downwardlyinclined relative to the bed-stone, and whereby any plastic material may be removed from the curb f and discharged through said trough, which is removably connected to the scraper.

From the description of the disposition of the milling elements in this machine it will be seen that in pulverizing effect the elliciency of the stone 17 is greater than that of the stone 18, because of the greater circumferential speed of the former, and that the lightest contact between any two of the milling-surfaces will be the contact between the peripheries of the two stones, and between the periphery of the stone 18 and the curb. Thus when the bed-stone rotates in the `direction indicated in Fig. 2 by the arrow the two millstones will be located more or less to the right of a line at right angles to the bar and if the bed-stone rotates in the opposite direction the stones would be located at the other side of said line.

This machine while adapted to grind many substances is more particularly adapted to the grinding of chocolate in the manufacture of that commodity.

Within the base of the casing a coil of steam-pi es 30 may be located, whereby the mill may e heated, if desired, for the grinding of such substances as chocolate, for exam le, in the grinding of which heat is require to maintain the material in a proper state of plasticity.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. .ln a grinding-mill, a circular bed-stone supported on an inclined axis and provided with a peripheral curb, in combination with IOO two millstdnes located on the lower part of the bed-stone to bear against the curb and one against the other, a driving connection exten ing'to the axis of the bed-stone to rotate the millstones in the same direction, and

one against the other, means to support the millstones one side of the center. of t e lower side of the bed-stone, a driving connection extending to the axis of the bed-stone to rotate themillstones in the same direction, and

` means to rotate the bed-stone in a contrary direction.

3. In a grinding-mill, a circular bed-stone supported on an inclined axis and provided with a'peripheral curb, a casing, and-a suitable base therefor to inclose said curb and bed-stone, a bar extending transversely of the casing, an inclined spindle supported in the base of said casing and in' said bar, two millstones located on the lower art of said bed-stone to lbear on the curb an to bear one against the'other, means on said bar to support the millstones in fixed position, driving means on said spindle extending to each oi the millstones to rotate the latter in the same direction, and means to rotate the bed-stone in a direction contrary to that of the millstones.` y

4. In a grinding-mill, a circular bed-stone supported on an inclined axis and provided with a eripheral curb, in combination with two millstones located on the lower part of the bed-stone to bear against the curb and one against. the other, a driving connection extending to the axis of the bed-stone to rotate the millstones in the same direction, at different rates of speed, and means to rotate the bed-stone in a contrary direction.-

5. In a grinding-mill, a circular bed-stone having a peripheral curb, a spindle to support said stone in an inclined position; two millstones to rest on theA bed-stone and spindle on against the curb, means to support said 5o stones in driving relation to the spindle, and a suitable driving connection between the latter and said stones, together with means to rotate the bed-stone to produce an abrading-action between vthe millstones and the bed-stone and between the millstones and the curb.

6. In a grindingmilla circular bed-stone i provided with a peri heral curb, a spindle to support the latter'in an inclined position, 6o two millstones located on the lower portion of the bed-stone to bear on said curb and one against the other, the axes ofsaid millstones being parallel with said spindle, said millstones being capable of movement toward and from the spindle; a connection between the spindle and said millstones to rotate the latter to produce an abrading action between the millstones and the bed-stone and between the millstones and the curb of the 7o bed-stone and means to rotate the bed-stone in a direction contrary to the rotation ofthe millstones. i

7. A grinding-mill comprising la circular bed-stone provided with a peripheral curb, a 7 5 which the latter is mounted, and` bearings to support the spindle in an inclined position, a bar extending transversely of the i bed-stone and constituting one of the bearings for the spindle; an arm extending from 8o said bar, a `ear supported on a stud 1n said arm, the axis of the ear and spindle being parallel; two opposite y-extending arms pivotally engaging said stud, and two millstones located respectively at the free ends of said 8 5 Vpivoted arms; gears on the axis of said millstones meshing with` the gear on said stud, and a gear on the spindle which is in mesh with the ear on said stud; means to rotate the spind e and coincidently rotate the mill- 9o stones in the 'opposite direction, l'said millstones being located on the lower portion of said bed-stone to bear also against said curb.

GABRIEL CARLSON; Witnesses: y

K. I. CLEMoNs, WM. I-I. CHAPIN. 

